andCenters and Free-Carrier Absorption in BaO
- 25 September 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 29 (13), 861-864
- https://doi.org/10.1103/physrevlett.29.861
Abstract
The and bands in BaO at 77°K are observed to be at 2.3 and 2.0 eV, respectively. The ground state for the centers is about 0.1 eV below the conduction band. Above 77°K the centers are partially ionized so that the observed band is composite. The released electrons give rise to a free-carrier absorption in the near infrared. The configuration-coordinate diagram shows a barrier to recombination, and recombination by tunneling is observed. These centers are believed to be the long sought-after donors in oxide-coated cathodes.
Keywords
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